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Search Results: 1 - 10 of 6815 matches for " Tomá? Lackner "
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Afroprinus cavicola gen. et sp. n. from the Afrotropical region with notes on cave-dwelling Saprininae (Coleoptera, Histeridae)
Tomá? Lackner
ZooKeys , 2013, DOI: 10.3897/zookeys.294.4800
Abstract: A new genus and species from Kenya, Afroprinus cavicola is herein described and illustrated and its systematic position is discussed. By the prosternal pre-apical foveae connected by marginal prosternal stria it resembles most of the Afrotropical species of the genus Chalcionellus Reichardt, 1932, or some species of the genus Pholioxenus Reichardt, 1932 from South Africa and Namibia. Afroprinus can be distinguished from Chalcionellus chiefly by the lack of pronotal depressions and a coarsely sculptured, non-metallic dorsum; from Afrotropical species of Pholioxenus it can be most easily distinguished by the asetose pronotal hypomeron. The new taxon was discovered in a cave, but lacks obvious troglophilic adaptations. Notes on other Saprininae taxa found in caves are given. An identification key to the genera of Afrotropical Saprininae is provided.
Description of a new species of Sternocoelis from Morocco with proposal of the Sternocoelis marseulii species group (Coleoptera, Histeridae)
Tomá? Lackner,Peter Hlavac
ZooKeys , 2012, DOI: 10.3897/zookeys.181.2953
Abstract: The Sternocoelis marseulii species group is proposed based on antennal and prosternal characters. Five species are included in the group: S. marseulii (Brisout de Barneville, 1866) (Spain), S. viaticus Lewis, 1892 (Algeria), S. vaucheri Lewis, 1896 (Morocco), S. berberus Lackner & Yélamos, 2001 (Morocco) and S. yelamosi sp. n. (Morocco). The external morphology of Sternocoelis yelamosi sp. n. is described and illustrated, the illustrations of genitalia of all species of the group (except for S. vaucheri) are provided and a key to the species of the group is given.
Description of Phradonoma blabolili sp. n. (Coleoptera, Dermestidae, Megatominae), with notes on the dermestid beetles from Angola
Ji?í Háva,Tomá? Lackner,Jana Mazancová
ZooKeys , 2013, DOI: 10.3897/zookeys.293.4891
Abstract: Phradonoma blabolili sp. n. from Angola is described and illustrated. Key to the Afrotropical “Phradonoma nobile species group” to which the newly described species belongs, as well as key to genera of dermestid beetles occurring in Angola is given. List of all species of Dermestidae known to occur in Angola hitherto is provided.
Chemical Integration of Myrmecophilous Guests in Aphaenogaster Ant Nests
Alain Lenoir,Quentin Chalon,Ana Carvajal,Camille Ruel,ángel Barroso,Tomá Lackner,Rapha l Boulay
Psyche , 2012, DOI: 10.1155/2012/840860
Abstract: Social insect nests provide a safe and favourable shelter to many guests and parasites. In Aphaenogaster senilis nests many guests are tolerated. Among them we studied the chemical integration of two myrmecophile beetles, Sternocoelis hispanus (Coleoptera: Histeridae) and Chitosa nigrita (Coleoptera: Staphylinidae), and a silverfish. Silverfishes bear low quantities of the host hydrocarbons (chemical insignificance), acquired probably passively, and they do not match the colony odour. Both beetle species use chemical mimicry to be accepted; they have the same specific cuticular hydrocarbon profile as their host. They also match the ant colony odour, but they keep some specificity and can be recognised by the ants as a different element. Sternocoelis are always adopted in other conspecific colonies of A. senilis with different delays. They are adopted in the twin species A. iberica but never in A. simonellii or A. subterranea. They are readopted easily into their mother colony after an isolation of different durations until one month. After isolation they keep their hydrocarbons quantity, showing that they are able to synthesize them. Nevertheless, their profile diverges from the host colony, indicating that they adjust it in contact with the hosts. This had never been demonstrated before in myrmecophile beetles. We suggest that the chemical mimicry of Sternocoelis is the result of a coevolution with A. senilis with a possible cleaning symbiosis.
Impact of Endofungal Bacteria on Infection Biology, Food Safety, and Drug Development
Gerald Lackner,Christian Hertweck
PLOS Pathogens , 2011, DOI: 10.1371/journal.ppat.1002096
Abstract:
Analysis of the Induction and Wake Evolution of an Offshore Floating Wind Turbine
Thomas Sebastian,Matthew Lackner
Energies , 2012, DOI: 10.3390/en5040968
Abstract: The degrees-of-freedom associated with offshore floating wind turbines (OFWTs) result in a more dynamic flow field. The resulting aerodynamic loads may be significantly influenced by these motions via perturbations in the evolving wake. This is of great interest in terms of OFWT design, placement and simulation. This study presents free vortex wake method (FVM) simulations of the NREL 5-MW wind turbine of a variety of platforms, operating in a range of wind speeds synthesized platform motion time series. Motion-induced wake perturbations are observed to affect induction. Transitions between windmill and propeller states are also observed.
Disinfection for prevention and control of infections on the threshold of the 21st century for the critically ill patient
Lackner, Franz X.
GMS Krankenhaushygiene Interdisziplin?r , 2007,
Abstract: In infectious diseases we can discern a cause and effect chain, which in particular offers the practicable perspectives of prophylaxis and treatment. However, to date we have not been able to control them. Apart from new epidemics, such as those caused by HIV and SARS, long-forgotten scourges like TB are enjoying a comeback. Furthermore, the advances made in clinical medicine mean that induced immunosuppression, for instance as a result of major surgery or organ transplantation, has become a serious problem in intensive care units. The body’s natural barriers are breached through medical interventions while, on the other hand, immunocompromising therapeutic agents such as cytostacis and glucocorticoids ensure that invading microorganisms will be able to multiply. Drugs administered as stress ulcus prophylaxis give rise to a shift in the bacterial flora of the throat, thus laying the foundation for a lower respiratory tract infection. With regard to bacterial resistance, antibiotic therapy, especially when used as prophylaxis, results in the bacteria becoming less sensitive to the drugs, while reinforcing selective pressures. The hands of personnel as well as the therapeutic devices ranging from the respirator to the catheter are the chief sources of infection in intensive care units. Disinfection, antibiotic therapy and, possibly, extracorporeal elimination methods can be contemplated to selectively prevent the establishment and multiplication of microorganisms. However, only disinfectants are able to unleash their full destructive might against microbes, especially when used for medical devices that are not amenable to sterilization, even if their subsequent removal and, possibly, the issue of staff hand protection, can be a problem. While it is not easy to furnish proof of a direct link between efficient control and prevention methods and the incidence of infection, there is by now a consensus on the role of hand hygiene and of disinfection of the human body and of surfaces. In an age when medicine, in particular intensive care medicine, is at risk of becoming impaled on its own sword, disinfection could serve as a bulwark against rising infection rates.
Multi-scale linear solvers for very large systems derived from PDEs
Klaus Lackner,Ralph Menikoff
Mathematics , 1998,
Abstract: We present a novel linear solver that works well for large systems obtained from discretizing PDEs. It is robust and, for the examples we studied, the computational effort scales linearly with the number of equations. The algorithm is based on a wavelength decomposition that combines conjugate gradient, multi-scaling and iterative splitting methods into a single approach. On the surface, the algorithm is a simple preconditioned conjugate gradient with all the sophistication of the algorithm in the choice of the preconditioning matrix. The preconditioner is a very good approximate inverse of the linear operator. It is constructed from the inverse of the coarse grained linear operator and from smoothing operators that are based on an operator splitting on the fine grid. The coarse graining captures the long wavelength behavior of the inverse operator while the smoothing operator captures the short wavelength behavior. The conjugate gradient iteration accounts for the coupling between long and short wavelengths. The coarse grained operator corresponds to a lowerresolution approximation to the PDEs. While the coarse grained inverse is not known explicitly, the algorithm only requires that the preconditioner can be a applied to a vector. The coarse inverse applied to a vector can be obtained as the solution of another preconditioned conjugate gradient solver that applies the same algorithm to the smaller problem. Thus, the method is naturally recursive. The recursion ends when the matrix is sufficiently small for a solution to be obtained efficiently with a standard solver. We have tested our solver on the porous flow equation. On a workstation we have solved problems on grids ranging in dimension from $10^3$ to $10^6$, and found that the linear scaling holds.
Potential Errors and Test Assessment in Software Product Line Engineering
Hartmut Lackner,Martin Schmidt
Computer Science , 2015, DOI: 10.4204/EPTCS.180.4
Abstract: Software product lines (SPL) are a method for the development of variant-rich software systems. Compared to non-variable systems, testing SPLs is extensive due to an increasingly amount of possible products. Different approaches exist for testing SPLs, but there is less research for assessing the quality of these tests by means of error detection capability. Such test assessment is based on error injection into correct version of the system under test. However to our knowledge, potential errors in SPL engineering have never been systematically identified before. This article presents an overview over existing paradigms for specifying software product lines and the errors that can occur during the respective specification processes. For assessment of test quality, we leverage mutation testing techniques to SPL engineering and implement the identified errors as mutation operators. This allows us to run existing tests against defective products for the purpose of test assessment. From the results, we draw conclusions about the error-proneness of the surveyed SPL design paradigms and how quality of SPL tests can be improved.
Structure in Dichotomous Preferences
Edith Elkind,Martin Lackner
Computer Science , 2015,
Abstract: Many hard computational social choice problems are known to become tractable when voters' preferences belong to a restricted domain, such as those of single-peaked or single-crossing preferences. However, to date, all algorithmic results of this type have been obtained for the setting where each voter's preference list is a total order of candidates. The goal of this paper is to extend this line of research to the setting where voters' preferences are dichotomous, i.e., each voter approves a subset of candidates and disapproves the remaining candidates. We propose several analogues of the notions of single-peaked and single-crossing preferences for dichotomous profiles and investigate the relationships among them. We then demonstrate that for some of these notions the respective restricted domains admit efficient algorithms for computationally hard approval-based multi-winner rules.
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